Assessing Best Locations for Mini-Implants in the Mandibular Symphysis Based on Different Mandibular Growth Patterns:...

Area of Science:

• Orthodontics
• Dental Implantology
• Craniofacial Anatomy

Background:

• Orthodontic mini-implants are vital for anchorage in complex tooth movement.
• Mandibular symphysis offers a potential site for mini-implant insertion.
• Understanding bone dimensions relative to mandibular growth patterns is crucial for successful placement.

Purpose of the Study:

• To determine the optimal insertion site for orthodontic mini-implants in the mandibular symphysis.
• To evaluate bone dimensions (complete bone width and cortical bone width) at various depths and angles.
• To assess the influence of different mandibular growth patterns on these bone dimensions.

Main Methods:

• Cone-beam computed tomography (CBCT) scans of 45 patients (16-30 years) were analyzed.
• Patients were categorized into low, average, and high mandibular angle groups.
• Bone width measurements were taken at specific heights (2-12 mm from CEJ) and angles (0-60° to occlusal plane).

Main Results:

• Complete bone width and cortical bone width were significantly greater in the low-angle mandibular growth pattern group.
• Optimal bone dimensions were observed at insertion heights of 8-12 mm below the CEJ.
• Cortical bone width was consistently greater in the low-angle group across measured parameters.

Conclusions:

• The mandibular symphysis in low-angle growth pattern patients presents favorable anatomy for mini-implant placement.
• Ideal insertion sites are recommended between 6-10 mm below the CEJ, angled 0-60° to the occlusal plane.
• CBCT assessment is essential for personalized treatment planning to enhance mini-implant stability and success.